Don't throw when getting selection(Direction|Start|End) on input

third_party/WebKit/Source/core/html/HTMLInputElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
@@ skipping 531 matching lines @@
   m_stateRestored = true;
 }
 
 bool HTMLInputElement::canStartSelection() const {
   if (!isTextField())
     return false;
   return TextControlElement::canStartSelection();
 }
 
 unsigned HTMLInputElement::selectionStartForBinding(
+    bool& isNull,
     ExceptionState& exceptionState) const {
   if (!m_inputType->supportsSelectionAPI()) {
-    UseCounter::count(document(), UseCounter::InputSelectionGettersThrow);
-    exceptionState.throwDOMException(InvalidStateError,
-                                     "The input element's type ('" +
-                                         m_inputType->formControlType() +
-                                         "') does not support selection.");
+    isNull = true;
     return 0;
   }
   return TextControlElement::selectionStart();
 }
 
 unsigned HTMLInputElement::selectionEndForBinding(
+    bool& isNull,
     ExceptionState& exceptionState) const {
   if (!m_inputType->supportsSelectionAPI()) {
-    UseCounter::count(document(), UseCounter::InputSelectionGettersThrow);
-    exceptionState.throwDOMException(InvalidStateError,
-                                     "The input element's type ('" +
-                                         m_inputType->formControlType() +
-                                         "') does not support selection.");
+    isNull = true;
     return 0;
   }
   return TextControlElement::selectionEnd();
 }
 
 String HTMLInputElement::selectionDirectionForBinding(
     ExceptionState& exceptionState) const {
   if (!m_inputType->supportsSelectionAPI()) {
-    UseCounter::count(document(), UseCounter::InputSelectionGettersThrow);
-    exceptionState.throwDOMException(InvalidStateError,
-                                     "The input element's type ('" +
-                                         m_inputType->formControlType() +
-                                         "') does not support selection.");
     return String();
   }
   return TextControlElement::selectionDirection();
 }
 
 void HTMLInputElement::setSelectionStartForBinding(
     unsigned start,
     ExceptionState& exceptionState) {
   if (!m_inputType->supportsSelectionAPI()) {
     exceptionState.throwDOMException(InvalidStateError,
@@ skipping 1291 matching lines @@
 
 bool HTMLInputElement::hasFallbackContent() const {
   return m_inputTypeView->hasFallbackContent();
 }
 
 void HTMLInputElement::setFilesFromPaths(const Vector<String>& paths) {
   return m_inputType->setFilesFromPaths(paths);
 }
 
 }  // namespace blink